// const sy = Symbol("哈哈");
// const sy1 = Symbol("哈哈");

// console.log(typeof null);

// console.log(null + 1);
// console.log(undefined + 1);

// const a = 1;
// a.b = 2;

// console.log(a.b);

const a = {};

const b = a;

a.name = 1;

console.log(b.name);
